GM David Poile says that Grimson hasn't retired, but still hasn't made a lot of progress from the postconcussion syndrome that sidelined him for the final 51 games of last season, the Nashville Tennessean reports.

Grimson (concussion) finds himself at a frustrating standstill that's left his NHL career in doubt, according to the Nashville Tennessean. Persistent headaches are the latest symptom to plague him since he suffered concussions last season.